fix: 修复删除返回按钮后JS报错导致数据不渲染

- 01-verify-inspection.html 添加 topBackBtn 空值保护
- 避免 document.getElementById('topBackBtn') 返回 null 时 JS 崩溃

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

other-module/canteen-device/raw-veg-inspection-scale/01-verify-inspection.html

@@ -1160,11 +1160,12 @@
 
       /* 根据来源设置返回目标页 */
       refererPage = detectRefererPage();
-      document.getElementById('topBackBtn').href = refererPage;
+      var backBtn = document.getElementById('topBackBtn');
+      if (backBtn) backBtn.href = refererPage;
 
       initDirectSupplierSelect();
       renderOrderCards();
-      bindBackBtn();
+      if (backBtn) bindBackBtn();
       bindCameraClick();
     }